Table 2.
Histologic Group | Observed | Expected | Standardized Incidence Ratio (95% Confidence Interval) |
---|---|---|---|
Adenocarcinoma | 35 | 24 | 1.47 (1.03–2.05) |
Squamous cell carcinoma | 507 | 140 | 3.62 (3.31–3.94) |
Adenosquamous carcinoma | 10 | 6 | 1.83 (.88–3.36) |
Other /Unknown | 57 | 15 | 3.89 (2.95–5.05) |